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@Mc_Nebula
Theres more info on the alarmed disc lock here. They are designed for fitting to motorbike disc brakes, but fit most chainrings too. If the bike is wobbled for more than about 3 seconds, they emit a 120db siren. Ear-bleeding-ly loud... And attached to your chainring, they can't ride off.
https://www.lfgss.com/thread24813.html